Examine source code of eevee background & cursor

{
  "manifest_version": 2,
  "name": "eevee background & cursor",
  "version": "4.0",
  "description": "changes the background & cursor to eevee! Also when you click it crys.This only works on google",
  "icons": {
    "48": "48.png"
  },
  "web_accessible_resources": [
    "cry1.mp3",
    "cry2.mp3",
    "bg5.jpg",
    "128.cur",
    "e.cur",
    "ball.jpg"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "css": [
        "test.css"
      ],
      "js": [
        "sound.js"
      ]
    }
  ]
}